Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

What should be the minimum distance between the observer and the reflector in order to hear an echo?

1

17.2 m

2

21.5 m

3

19.8 m

4

More than one of the above

5

None of the above

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